What is causing my girlfriend's brown discharge and fever after sex?

The brown discharge your girlfriend is experiencing after sex could potentially be a few things. One common cause might be light spotting due to hormonal fluctuations, especially if she’s on hormonal contraceptives. However, more concerning possibilities could include an infection or sexually transmitted disease (STD), both of which could also explain the fever and vomiting. Bacterial vaginosis, yeast infections, or trichomoniasis might cause unusual discharge and can often be accompanied by other symptoms like fever or discomfort, although the discharge is often described differently. Meanwhile, an STD like chlamydia or gonorrhea might present similarly and require immediate attention. Pelvic inflammatory disease (PID) should also be considered, especially with fever. PID can occur if an STD goes untreated, potentially leading to serious complications. These signs strongly suggest seeing a healthcare provider promptly for a proper diagnosis. They may recommend a pelvic exam, STD testing, or other diagnostics based on their assessment. It’s crucial to identify if there’s an underlying infection, and if so, begin appropriate treatment, potentially including antibiotics. In any case, until a healthcare professional is consulted, it might be wise for both of you to refrain from further sexual activity to prevent any potential spread or irritation. Additionally, if the symptoms worsen or persist, particularly fever or vomiting, seek medical help immediately as these could indicate a more significant underlying issue.